Thalerosphyrus thailandensis, Sutthacharoenthad & Sartori & Boonsoong, 2019

Sutthacharoenthad, Waranid, Sartori, Michel & Boonsoong, Boonsatien, 2019, Integrative taxonomy of Thalerosphyrus Eatonı 1881 (Ephemeropteraı Heptageniidae) in Thailand, Journal of Natural History 53 (23), pp. 1491-1514 : 1500-1502

publication ID 10.1080/00222933.2019.1657513

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scientific name

Thalerosphyrus thailandensis

sp. nov.

Thalerosphyrus thailandensis sp. nov.

( Figures 4 View Figure 4 (a–c), 5(a–c), 6(d), 7(d), 8(b), 10(d), 11(d), 12(a–f))

Materials examined

HOLOTYPE: mature nymph on slide, Soi Sawan waterfall , Ubon Ratchathani Prov., 15.459933°N, 105.578350°E, alt. 267 m, 3-II-2017, B. Boonsoong leg. ( ZMKU). GoogleMaps

PARATYPES: 1 nymph on slide and 3 nymph in ethanol same data as holotype ( ZMKU); GoogleMaps 1 nymph in ethanol same data as holotype ( MZL); GoogleMaps 1 larva (on slide), Sarika, Nakhon Nayok Prov., 14.296194°N, 101.269583°E, alt. 20 m, 23-I-2016, B. Boonsoong leg. ( ZMKU). GoogleMaps

Head. Labrum expanded laterally, ca. 3.8 times larger than long, with round apexes; dorsal surface and anterior margin covered with long thin setae ( Figure 12 View Figure 12 (a)). Maxilla with long, simple setae on inner margin of galea-lacinia and with fimbriate setae scattered on ventral surface. Basal segment of maxillary palp with rows of thin and simple setae on inner and outer margins; apical segment pointed, with rows of simple setae on outer margin. Crown of the galea-lacinia of the maxillae with ca 16 combshaped setae ( Figure12 View Figure 12 (b)). Mandibles strongly bent in their distal part; lateral margins with several rows of long and thin setae; left mandible with outer incisor serrate on inner margin, composed of ca. 6 teeth; inner incisor bifid, bearing two seta-like; with 6 fimbriate setae below the inner incisor ( Figure 12 View Figure 12 (c)). Right mandible with outer incisor serrate on inner margin, composed of ca. 8 teeth; inner incisor trifid; 9 fimbriate setae below incisors ( Figure 12 View Figure 12 (d)). Hypopharynx with robust lingua bearing a tuft of small setae, superlinguae densely covered with long and thin setae replaces before the apex by small setae up to near the lower part of superlinguae ( Figure12 View Figure 12 (e)). Labium with glossae rhomboid, almost straight on their inner and outer margins near the apex ( Figure 12 View Figure 12 (f)).

Thorax. Pronotum weakly expanded, not wider than the head and basally not fused to the mesonotum ( Figures 4 View Figure 4 (a–b) & (5a–b)). Fore femora with submarginal row(s) of stout bristles on the inner and outer margins. Hind femora with submarginal row of pointed bristles on the inner and outer margins and subparallel or slightly convergent margin, apex rounded ( Figure 7 View Figure 7 (d)). Hind tibia with one row of thin setae in marginal position ( Figure 8 View Figure 8 (b)) and a row of 10–12 pointed bristles in the marginal or submarginal positions. Tarsal claw with 3 teeth ( Figure 9 View Figure 9 (d)).

Abdomen. Posterolateral expansions not developed on segment I and II, weakly developed on segment III–IV, moderately developed on segment V and reaching their maximum size on segment VIII ( Figures 4 View Figure 4 (c) & 5(c)). Gill I with asymmetrical elongated and rounded plate, 2 times longer than wide. Gill II–VI strongly asymmetrical, wider than long ( Figure 10 View Figure 10 (d)). Gill VII oval and almost symmetrical. Posterior margin of tergites with irregularly pointed teeth and a few microdenticle rows ( Figure 11 View Figure 11 (d)). Cerci brownish red with medium brown bands increasing in size towards the apex. Paracercus whitish in the proximal part, with a dark brown band every 2–3 segments.


The epithet is derived from the name of Thailand, referring to the type locality.


Ukraine, Kiev, Zoological Museum


Kiev Zoological Museum


Musee Zoologique